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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e7d31096895f951ff1d4cfa0d5cc9cc5be46a16e1f1ec0e6f75e1447cee981' 
  AND token = 'K+xXUXP26MkqaZkgIsFh9BYcbcYu10SrO/nQTH96GaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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