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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a71a4ad687ed11d4e7ec68563812ce92e4baf47c539a200782a05f349523a09' 
  AND token = 'XL5PfR8ZVDNu9Zbq88DTxqCcmQku5LAWtQyx+hQQvSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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