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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4583e1b83f39f22a1612e00f910f8c12623f94f76e4d69ed72272c70f7d42e' 
  AND token = 'cRSDOl2QnUR2dP8X2D9SPN53hAXeJCC5uwvkK1YT3cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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