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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b057eb53c65034d1b6b11b41c414594ef0b614bec0d1543eca04dee3f96f17bf' 
  AND token = '4ldl3IpsART/eH3onlcm99whJ6iS4WzFetHm4LhooNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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