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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5be03cff87be0bce3fe4137079d90ebf1983ee23c90ab3e499d629da20fec9' 
  AND token = 'RmNCCstNl/ipn3XGfPS/YU7XuyorEXYxq7SV5vvweQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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