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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6876e395a94449f7c4253392f98894295608900398050275ff74925cdfea9a0' 
  AND token = 'WN5BVRNhvrProy1936P1ypxhuGAu9HTKpwV4Ig0GEkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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