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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c1c28979818075762445b6167edabe799ef1829201d2689cfafe43c1a1a171' 
  AND token = '3cmBiEnFWQj25vSJ/3A04ijwOo0Onnj3fqqtb0mTcVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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