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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e2137313a9017eeccb8435348e802f5bb15122e177522bc7cd6f5d99400e45' 
  AND token = 'IAmF6p8l2X2OvWfI3jhHjMKsMYf2IE0xhVyqanAxghw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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