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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8022138dae1a946d54405f4b71e305a7b80c2613e31ad7ad4f6b98b5394249' 
  AND token = '1WUCoyBXfA/2B3wp//kaWbbi4gljtLuiXwYUURmzg6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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