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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '397f5bb151b0fd2fc0d35df566b772548958e7dd4c55ae8db4377061bf98bbe7' 
  AND token = 'h0HhGufR6jS6hUE1/L/DRMykj3Cl9ADlR7zQd4hWux4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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