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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83784e0219f802f6bcbb5a5e0030c72f0c167a36894297b0f46f1abcdb64c41f' 
  AND token = 'VNHxkn+D3mL9QX7ImHt8IDLwR8QMS/v00HIapJD1YLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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