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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60840201b1a7a20a5d34311c9dfb0b6abbf82a1ec3e9c7a7d195939a84e17a2' 
  AND token = 'pcOUmYdnRv5Pm4bnOakNp7tXbUNeGJmzD3vyCx13JK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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