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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be38658026f633c3d30be3868ed784d677e61a8f76a1c83a5b251a7f9d3dd408' 
  AND token = '/jD9t5ahT36NcMQMmwbm/NSDE79KJRlYUdORt3fANVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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