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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1fd3e84245d4a13d447ce858ce4087883ed903f2d7d889c2d186230ff0ead28' 
  AND token = 'jPrRgNl+ik5K5bn/YdxwM8nBZtQTa1oydQI4XUu8VHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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