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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3661eb895bce716109b558c4424392366c6e49f9611fe5704015648db23fc44' 
  AND token = '2BPGtCXb4DvZAl7Rjye+33Ka89WB/Mo66iQ0cItaA7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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