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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db98b48043ed87105f22b02ac411927df9c16d5cc9ab0bf3a467c7682fe9fa74' 
  AND token = 'FU2QEpP47IMJgF6VPtWl7zdV241/JK93YZ1xRl2LQXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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