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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d4b02353c4d6352ebcd7afacff10c5aaa2234c121e7e065e589f5c111ac6ef' 
  AND token = '12pqyvgKIZgbDMLMqDt18QgqMK5YFG8901Azw11c0i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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