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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a3e75ec8b76177322f07ce6a8d5910c189c491fc1b973212551981bd211e1f' 
  AND token = 'C8inzGFRGHQe0ejtL1ebGpMG4njI5jW8nr6FFIL8D5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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