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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a41ed3d1d4e371edbd5a9d117afd6c71d0c8c5a77cd36cbcdb34d5c753f1b9e' 
  AND token = 'fW7KMlmgeq9z/kYNMgwZroiwkQikL2c4eEnTvPYfibs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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