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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6f5502404cac1718e22b8edaab221c1e764ecf09442d2f0c9fc11af85ff212a' 
  AND token = 'GL2lGMjlmWkmlK7GfcWhfhEV4B4cR2oU/azhMe3QcBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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