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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41dea1dc1552cf4bc4320e2e3e78d2d680d89cc87db13781490ffcfdbbfb9f2f' 
  AND token = '83zd6kxrt1fMoNDxJdIni2sN70HNH4WeUksC8eiZte8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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