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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75488b01e5d5ceca45560024199f2b434bb4e1b4cd0166a4d1dbf5e6fd8d95c4' 
  AND token = 'Wx+X/7Z1AHTo0xJSPqIBEPxJ0fWMPbWSSzRh/kvliCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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