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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3ec4ea5a40ff6cb555e9b6b82b1573ddd40ebc6e50b29ecb5461014ee17f179' 
  AND token = 'E5RLvaihaa7QC5PP1QBn8+BEkyS2j755ybG5pcxmqXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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