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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0934e70fe2fb0e608f085df04f7e95cd290fbe2f2b08b2b011d264546c3b72' 
  AND token = '0RXDCE5cRPQ8TBEP3ZlnIrMHn2QI9MdzZ8Uuz9uDp8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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