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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a89ae8c90a285375397292bd51ed6a98c9619c5235fb21dcedb7d78223f9d61d' 
  AND token = 'h9+LH+ezmt8Dp9vBiKc/jPsYL8O/2I9YL43H5AqhYbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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