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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c5cf66b188c71d810ba4f77e45ced38bb6a4d4471e5f1a4fb6d92e029eef20' 
  AND token = 'Q7Ah4SRzabRcnoNRmfo5tdqxfe29o9BnWvoa8s1qqyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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