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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b56283d6aee62559a1cc8344ce68adf153e3006af1ae8bb0fcbee2856b9ef64' 
  AND token = 'qgyumNX4+I5z3Ky20+7HauvmLEQKked9w60z/RJJSus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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