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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73996235c907b019314680bf73bb9c988337e69c843b4e64ded2bfb785386e38' 
  AND token = 'mUHrJzvRQ8yLANMR5pJIwHRXiNMOxMVezXqlnCHj6NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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