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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53a2663bfef17d7a62e262054042be1062624923860af7e3c8c3041cee009c9' 
  AND token = '5XRBZ+P1Ps06haGpAy2nSmLF9yhqyRrxAUw5BBuS2uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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