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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78e5865bf735bbedc33e76360f449309c6cef389c1eae2326bee8ee86bd9a052' 
  AND token = 'bTfBaBVMrDH55R/MQSPGZN1M51HNlOK6NFL3fem+gTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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