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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6158554bb8e53b0259b510e30ba8b029f4d39671c04b7c1c18646fb3ec6bbf3' 
  AND token = 'zVbooa7uvZ+67xD234qzqEoums4gcvdSqsyTwbA+3mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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