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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9edcc43d4f2310a58409495d8c8ea2955367825acacc3a3411273cde97cf7c3' 
  AND token = 'm+l0NwYgfIBUCmRJz3gr0/sNXxCq+JqeVl/elpVLSe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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