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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a518bdcdc3da356e642493e6ab6ba18dbff86e7b6ddd849fa670713b56b2ddc' 
  AND token = '/3S0PX2b0JGObKEqQ4ptFI0OuEbR1/vVCOMHIxcTZZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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