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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9faa2e8248245e3eca0d923fb11a1893a9f63e063db89e9bec3ad080a2a8c9b1' 
  AND token = 'hLB64v4V54geNHAtun6ZatdjZ8jZegEIPAPr/Z4EB6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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