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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b17ef59fb845e84c319e6444ba8edc06713ba7872e243b9d00fa3bebebafdf4' 
  AND token = '9wRZjdPfaT0S41ylk60jSu5J91mdGOtHTY1VxVB7+0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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