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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b094b33bc4d1f155b8c3b656bb21e82f33c3e69e858acf84c4e189850db3e716' 
  AND token = 'f2it+dRuOOFjJ5yeD2d8wdupwYJFQ93vFUi2Zo8wgOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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