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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dabdd1ec425dd252b2e8b8ce0b977c842f988098a64833936f35162d2d53e5cb' 
  AND token = 'eSLrCl8KoSdpcEiiYfNGEX1+6vdEdPcmjUiyr85rdmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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