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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94a5f8bdd976f1cb5f63d77b774a1ca6ddbb579102c27b4f69d6365617b07a69' 
  AND token = 't43ccvqxHI4T0vjk0xkiU13EOrtvugc3VYv0Tn4TQsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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