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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f40753a1b34dc88498f7b4f157ffc191e8055b91fb298b70aa59fff0fd4cf6c' 
  AND token = 'tLjcMVv/cSPm6mG0da6V0TI+g+hIcoD+1P9NcQy3+5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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