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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2600ae82887b58da967c695d7bb63372db9387c4fa8463f2fc7bab9d5de79da1' 
  AND token = 'sftM7U2NqhhAOn5vLpCGG0ueFDAcqJekSF8aew7ngIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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