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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca17ec2ea7dfe858f313ca46b99f0093eefbeffc7393f5580b8196f0c6035818' 
  AND token = 'xGg6WQhfdZ9a2Ts0ym0LTATpYOtPVvmaT3N9A3/ebcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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