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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09658efbed0a747fc2efcf086df2886926f1686d72f6f550b240cbe84c1b9d77' 
  AND token = 'HSvjBA4HEefSvsWDMcvoQE+bI7/h85PHJyITJtKCT7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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