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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d1786b086078354f2a2ac37389825e8a1a2ee28d2985d3f3e0a55b6d7f7302' 
  AND token = '7oFWMirBA+s168/suKbuf7dsr/HsaPWdngOe+quB5Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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