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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d676b8dcf4cd7a6a4a58ec1d9fd78d8849e1c5b701150e104784d41e889d3d' 
  AND token = 'oY2kcrX6WJFJfJIKNs67zqCmvK0bhP3blLNV5wDap9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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