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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e690b6e0b751ea5354f645d0ded516ce2a45114b9403505aa794fa1757bd43cd' 
  AND token = '/zEMqIclQiI1ZkaNUA3xlHTPIdffJ2hWL44dPzALg7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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