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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '950b1dfcc8c624a5ff52a5ccf9fea21569194a6c7f9dd8f885540c77b78bff96' 
  AND token = 'D36K08Gb5fbfPuEJmomqL6aZ+VQi7Y9Z7ZeGlzEyttc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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