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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792df3cc29fbef5504949ed8f056d13a9f2a642e929c81ef3025aafd590d6bb6' 
  AND token = 'FM9s8x33AsxG/KECy/QG0aT6pfP9G2A6GgJ56ypiO7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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