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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e175dcfadf01f4a7b51011e454b7e215e781f33febb8aecaff4865a178575c3' 
  AND token = '42c16x94ZNX7ZAj//eSBC4DM484ainqtoRhX/5dheqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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