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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58c0759d0a2dd3a4ae6bb0e374986dcfacc8052b28e2c0af978b2b4d61b228b9' 
  AND token = 'xbaAPxj5h9tfvht4DxTWZj/3a5hgZZdTr1USkEHmSNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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