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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cfba13af0c2dd55143f298a9c5f13d98f2eb1cbf23fa487c3788db518430288' 
  AND token = 'dxbFRNtjE3OcwzYkfA8gVx7VrI0P4l9HL/Ud2qIRqMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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