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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4527f8fc1062db8fd2403e62e507cff47f32797ebe63f366110abd82bb3001' 
  AND token = 'Q98vZf01AJkEj3djlcPJTJZ4lpMqPxIW2qZGfZPtOm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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