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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38fca5a7d93d0791899c3d5273f26578a2e8a2b022f1a52248d8e8ec250809b1' 
  AND token = 'vvuLL6CXM7u6CCvfOGz47DBareOTyv5Geq+tUXGY7Ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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