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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fab00f27d7742d0aa94e745abc770ff373cecb0b714128ca873db8efb2da0db' 
  AND token = 'L47npNpMs+VHrj+wlvXr1RWA/nJAG9c6Npj+vLii5Ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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