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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eabb7b52ed0fa103c1a07eaed5e1332e3b68c3dacd121a1a6be1d243c68512e5' 
  AND token = 'cgkF3jNl1ZQFmRF0X13GTZu2OqA2gMW+EMK/FfUL4ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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