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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95117056fc7c9ef8b07975a70027203cc0c1adfcee8e7b564c2578138e0cfdd1' 
  AND token = 'QoHMqjOVaBwbV2tI2wslqEMIMtmmffBF61ag/Fgg+Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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