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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d7a499b554f530b0173c55dd1ee0c61bbd73fe6c5baec19e410caf06bf1db2' 
  AND token = 'RRcex+CaHybLwp2kwwpjyVOKWSiQvY0qdmo2A6UyM6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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