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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5633fc546166a193d0b1ca2305c3eb70c195015477f57c6b94c71705fd7b40f' 
  AND token = 'kSqGakUrhcButZdPe9ELgG0xOaFewAoBWvkxz2GL6HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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