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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6508904593307a1b0b162c52f1e6fa8786969de0c8db14d288bee8094530cc9d' 
  AND token = 'grKqJTkO14uUhgBD9aAKfGAqTyIO4ZJDNIj554Ul/Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}