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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '562e0f8c0642ce99e3b6b4811ab0ea7a9b9550a64b0608701100d4ceedfa8456' 
  AND token = '1aSpBAiS3r2Eu3HI+VmtGQ+I0YfYpQjgP1/kPp0vdDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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